Compact air-air rooftop units
PJ range
Protections
High pressure pressostat(s). High and low pressure transducers. Compressor discharge temperature control. Main door switch. Magnetothermic protection switches for the power line of compressors and fan motors. Automatic switch in the control circuit. Control of the supply air temperature. Setpoint compensation based on the outdoor temperature. Hourly and weekly schedule. Fire protection. Diagnostic of faults and general alarm.
Optional functions:
This control is used to manage additional components such as: External air damper for the renewal of fresh air, depending on the temperature of the mixed air or depending on the air quallity sensor. Mixing box for thermal, enthalpic or thermoenthalpic freecooling. Cooling recovery circuit for the renewal of air. Rotary heat exchanger. Auxiliary electric heaters: two-stage with on/off control or single-stage with proportional control. Hot water coil with 3-way valve, with proportional or on/off control. Gas burner with proportional control. Humidifier with proportional or on/off control. Clogged filter detector. Smoke detection station. Refrigerant leak detector. Air quality sensor for measuring CO2. Energy meter and and calculation of the cooling and heating capacities. Zoning into 2 areas with dampers.
Electrical cabinet
Complete and fully wired electrical cabinet. Insulated panel cover to prevent condensation. Forced ventilation of the electric panel. Protection IP54. Cables numbered and identification of components in the electrical cabinet. Hinges + quarter-turn latches on the access panel. Electrical power supply with neutral. Main earth connection. Compressor and fan motor switches.
Electronic control
The control consists of a μPC MEDIUM control board, a graphic terminal, a user terminal (optional) and sensors. This system uses a RS485 field-bus to manage additional components. A BMS card (optional) allows the control board to be connected to a centralised management system. It also manages a local connection between units through a pLAN network (μPC MEDIUM Local Area Network), allowing data and information to be exchanged between units, for a maximum of 15 units.
Graphic terminal:
This terminal, installed on the electrical cabinet, is used to: Carry out initial programming of the unit. Modify operating parameters. Switch the unit ON / OFF. Select the operating mode. Adjust the setpoints. Display the variables controlled and sensor values measured. Display on the screen alarms and their historical record.
User terminal (optional):
This terminal can be installed on the electrical cabinet, instead of the graphic terminal. In this case, the graphic terminal can be connected remotely. Please consult the chapter “Options”. This terminal is used to: Switch the unit ON / OFF. Select the operating mode.
Main functions:
Selection of the operating mode: heating / cooling / auto / ventilation. Selection of the setpoint. Continuous control of the operating parameters. Display of the values measured by the sensors. Compressor time delays Defrosting management (in heat pump units). All-season operation via the condensation and evaporation pressure control.
Adjust the setpoints. Display the installation’s temperatures and humidity, outdoor temperature, supply air temperature, CO2 sensor and opening of the outdoor damper. Display alarms codes.
500
HEAT PUMPS - AIR CONDITIONNING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 17.01 A